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《College Mathematics》 2015-01
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The Study About Vertical Tangent Lines of Quadratic Curves

WANG Qing;Ministry of Mathematical and Physical,Suzhou Vocational University;  
We use the method of analytic geometry and projective geometry to discuss the track of intersection point about vertical tangent lines of quadratic curves,and prove that the track of intersection point about vertical tangent lines of ellipse,hyperbolic is circle and the intersection point about vertical tangent lines of parabola is on the directrix and the connection to the point of tangency pass focus.
【CateGory Index】: G634.6
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【Co-citations】
Chinese Journal Full-text Database 3 Hits
1 LU Cheng-jing,HUANG Gui-ping,LI Guang-yun,CONG Dian-wei,Fan Sheng-hong(Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China);Method of Realizing Automatic Measurement in Industrial Photogrammetry[J];Journal of Geomatics Science and Technology;2008-03
2 Tan Fuling(Heihe University,Heihe 164300,China);The Proof of Several Dual Propositions[J];Journal of Heihe University;2012-05
3 SHOU Le-li;XU Chen-dong;Faculty of Science, Ningbo University;;On Hyperbola in Hyperbolic Spaces[J];Journal of Ningbo University(Natural Science & Engineering Edition);2015-02
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